You can make your starch more resistant by freezing it. i didn't know that, cool! You can make rice more resistant by cooking and cooling as opposed to eating it straight away, too.
It genuinely makes me nervous how many non diabetic people talk about insulin so much why on earth are you nervous about people understanding how their bodies work?
I imagine there would be political fallout if the NHS revised its guidance and concluded that people need to eat a higher cost diet in order to be healthy.
I think you're right. A recently (thanks to pregnancy) diabetic friend of mine was saying how much more expensive it is to eat properly as a diabetic. Nuts, cheese, meat, avocados are all much more expensive than potatoes and pasta.
that's what I mean - if were weren't evolved to eat meat or fish every day, perhaps a feast once a week?, then 80%, 70% of our weekly meals would involve no animal protein.?
I think the whole what we evolved to eat thing is a fallacy anyway. We evolved to die by our 30s. Maybe diets to avoid disease that only takes hold after 40+ years weren't of any great benefit 
I’m talking bread, pasta, rice being the 3 main culprits that have pretty much NO nutritional value. They do nothing for your body, other than give it empty calories.
This type of hyperbole isn't helpful.
Wholegrain bread for example has carbohydrate (which whilst I advocate low card we do need some of and is still a nutrient), vitamin E, selenium, iron, magnesium, zinc, B vitamins and Fibre.
Even a quick Google for white bread shows it contains calcium, potassium magnesium, phosphorus and zinc, all of which are nutrients that our bodies need.
I'm not saying bread is the best choice and that there aren't problems with eating significant amounts of it but the hyperbole that normal foods that people have eaten for centuries have NO nutritional value is just not true.